feat: Add GitLab plugin

[bishalbera]

closes #10288

📋 Overview
This PR introduces a new GitLab plugin for Kestra, enabling seamless integration with GitLab's API to automate GitLab operations within Kestra workflows. The plugin provides essential GitLab functionality including issue management and merge request operations.

🎯 What This Plugin Does

The plugin-gitlab provides a comprehensive set of tasks to interact with GitLab projects through Kestra workflows:

🔧 Core Functionality
• Issue Management: Create and search GitLab issues programmatically
• Merge Request Operations: Create merge requests for code collaboration
• Secure Authentication: Support for GitLab personal access tokens and project access tokens
• Flexible Configuration: Works with GitLab.com, GitLab Enterprise, and self-hosted instances

📦 Included Tasks

Task	Purpose	Functionality
CreateIssue	Issue Creation	Create new issues with title, description, and labels
SearchIssues	Issue Discovery	Search issues by query, state, and labels with filtering
MergeRequest	Code Collaboration	Create merge requests between branches

[bishalbera]

@fdelbrayelle @Malaydewangan09 I've implemented those changes. Please check now. Thanks

[bishalbera]

@fdelbrayelle @Malaydewangan09 Did those changes. One more thing I'm getting warning saying Property.of() is deprecated.

[fdelbrayelle]

@fdelbrayelle @Malaydewangan09 Did those changes. One more thing I'm getting warning saying Property.of() is deprecated.

@bishalbera You can use whether Property.ofValue or Property.ofExpression instead

[fdelbrayelle]

@bishalbera Please can you mark as "Resolved" the discussions where you did the changes? Thanks!

[bishalbera]

@fdelbrayelle @Malaydewangan09 Did those changes. One more thing I'm getting warning saying Property.of() is deprecated.

@bishalbera You can use whether Property.ofValue or Property.ofExpression instead

Ya trying the ofValue

[fdelbrayelle]

It looks good to us so let's merge it! Good job @bishalbera and thank you! 🎉

[bishalbera]

It looks good to us so let's merge it! Good job @bishalbera and thank you! 🎉

Yayy! Thanks for all the help 🖤